This is a stand for all SCX24 trucks. Use the long rails to support the truck by the axles. This displays the truck as it would normally sit with the suspension compressed. Turn the base sideways and use the short rails to support the truck by the middle of the undercarriage. This is more of a storage configuration as it reduces stress on the suspension.
Both methods are compatible with all stock wheelbases and extended wheelbases up to about 150mm (e.g. Micro Shark). The long rails have been tested to work with the CR-24 and could be compatible with other Micros as well.
The rails print as separate pieces, so you can mix and match different colors. There is a small cubby in the middle for storage of small parts.